Hermetic closure for receptacles.



w. A. LORENZ. HERMETIC CLOSURE FOR RECEPTACLES.

APPLICATION FILED OCT. 29. i917.

Patented Nov. 5, 1918. I

I72 2/672 507* Wz'ZZz'am fl. Lorenz 5y sures for Receptacles, of which the follow- WILLIAM A. LORENZ, 0F HARTFORD, CONNECTICUT.

HERMETIC CLOSURE FOR BECEPTACLES.

Specification of Letters Patent.

Patented Nov. 5, 1918.

Application filed October 29, 1917. Serial No. 198,927.

To (all whom it may concern:

Be it known that I, \VILLIAM A. LoRENz, a citizen of the United States, residing at Hartford, in the county of Hartford and State ofConnecticut, have invented a new and useful Improvement in Hermetic Clocles that the free air can be easily and freely withdrawn from the interior ofthe receptacles by the exhausting apparatus usually employed, and the seal tightly and securely effected after the air has been withdrawn from the interior and the closures are subjected on the outside to normal atmospheric pressure.

To attain this object the closure has in its inner face an, annular groove that is wider than the edge of the mouth of the receptacle and'has outside of the groove a flange that will extend down about the outside of the edge ofthe mouth of the receptacle. Located in the groove in the closure is a fleXi-' ble gasket that has an annular groove in its exposed face. hen the closure with such a gasket is first placed over the receptacle I only a small portion of the exposed face of the gasket rests on the edge of the mouth of the receptacle and thus air can flow outward freely when the receptacle is being exhausted, but when the closure is pressed down the gasket spreads over an extended area inside and outside of the edge of the mouth of the receptacle and insures a tight and secure seal.

Figure 1 of the accompanying drawings shows a side view, with a portion cut in central section, of a receptacle and a closure constructed according to this invention, before sealing. Fig. 2 shows a similar view after sealing. Fig. 3 shows a plan of the gasket. Fig. 4 shows an edge view of the gasket. Fig. 5 shows on larger scale a section of a portion of the receptacle and closure before sealing. Fig. 6 is a similar View after sealing.

The receptacle 1 may be made in the form as shown in Fig. 5.

of a jar, can or bottle of any size and style,

of glass, porcelain or other suitable material. The upper edge around the Inouth of the receptacle is by preference slightly beveled inward and its outer corner rounded so to form a sealing shoulder 2. A. ledge 3 is desirably formed around the receptcle .just below the shoulder to provide an abutment against which an implement may be rested ior prying off the closure.

The closure 4 made of any suitable material has projecting downwardly from its outer edge an annular flange 5 of such size and shape that it will loosely fit over the sealing shoulder around the mouthfof. the

receptacle. Around the inner face of the closure inside of the flange is a groove 6 which is wider than the upper edge of the receptacle and isdesirably curved in cross section. A flexible gasket 7"usually made of rubber is located in the groove in the inner face of the ClOSUIBr The back of this gasket is shaped to fit the groove and in its exposed face is an annular groove 8. This groove is preferably curved in cross section and is located a little nearer the inside edge of the gasket than the .outside edge.

When the closure is first laid upon the receptacle only a small section of the outer edge of the gasket rests upon the sealing shoulder on the upper edge-of the receptacle This reduces to a minimum the area of contact between the edge of the receptacle and the gasket so that during the subsequent exhausting operation air can freely escape from the interior of the receptacle over its edge and under the edge of the gasket. This manner of grooving the gasket enables it to be made of a smaller amount of material and renders it more flexible, or less resisting than if made solid, so that when the closure is pressed down for sealing the receptacle the gasket will readily yield and spread itself over a large area about the outside and inside of the rim of the receptacle and fill in the space between the outer wall of the receptacle and the inner wall of the flange around the closure as shown in.

sisted by the grooved portion or by the hen rower inner edge portionof the gasket.

The invention claimed is;

1. A food container comprising a receptacle and a closure for the same, said closure having an annular flange outside of and projecting down below the upper edge of the receptacle and provided inside of the flange with an annular groove, with a fierrible gasket having an annular groove in itsexposed face located in the groove in the closure, the outer diameter of said groove in v gasket being less in diameer than the diameter of the outer wall of the run of the receptacle, whereby the gasket is renderedflexible and susceptible to compression and only the portion or the gasket outside at the groove rests upon the upper edge of the re ceptacle and offers but sli ht obstruction to the withijlrawal of air an the receptacle before sealin 2. A food container comprising a receptacle and a closure for the same, said closure having in its inner face an annular groove that is wider than the upper edge of thereceptacle, with a flexible gasket having an annular groove in its exposed face located in the groove in the closure, the outer diameter of said groove in the gasket being less in diameter than the outer wall of the rim of the receptacle, whereby the gasket is ren-' tiGlQCl flexible and susceptible to compression and only the portion of the gasket outside of the groove rests upon the upper edge of the receptacle and otters but slight ob struction to the withdrawal of air from the receptacle before sealing. v v

3. A food container comprising a receptacle and a closure for the same, said closure having a downwardly extending flangearound its outer edge andan annular groove that is wider than the upper edge of the receptacle inits inner face inside of the flange, with a flexible gasket having an annular groove in its exposed face located in the groove in the closure, said gasket being designed so as to have only a portion of its exposed face outside of the said groove rest upon the upper. edge of the receptacle,

whereby the gasket is rendered flexible and susceptible to compression and o'll'crs but from the receptacle before sealin 4. A food container comprising a receptacle and lOSlllQ the same, said closure having a downwardly extending flange around its edge and an annular roove in its inner face inside of the flange, with a flexible gasket having in its exposed face an annular groove that is nearer the inner edge than the outer edge of the gasket, located in the groove in the closure, said gasket being designed so that only a portion of its exposed.

face outside of said groove rests upon the upper edgeof the receptacle, whereby the hot being less in diameter than the outer Wall of the rim of the receptacle, whereby the gasket is rendered flexible and susceptible to compression and only the portion of the gasket outside of the groove rests upon the upper edge of the receptacle and offers but slight obstruction to the withdrawal of air from the receptacle before sealing.

WILLIAM Au LORENZ.

slight obstruction to the withdrawal of air i 

